PDF(5617 KB)
MnO2/碳球复合材料的制备及其电化学性能的研究
邢冠楠;刘云芳*;田艳红;段红英;迟伟东
北京化工大学学报（自然科学版） ›› 2014, Vol. 41 ›› Issue (2) : 41-47.
PDF(5617 KB)
PDF(5617 KB)
MnO2/碳球复合材料的制备及其电化学性能的研究
邢冠楠;刘云芳*;田艳红;段红英;迟伟东
Preparation and electrochemical properties of MnO2/carbon sphere composites
利用碳球为还原剂，在中性KMnO4溶液中制备出MnO2/碳球复合材料，并对其结构和电化学性能进行了研究。结果显示，随着碳球含量的增加，MnO2/碳球复合材料的循环稳定性提高，但比电容量降低；当碳球质量分数为35%时，MnO2/碳球复合材料的比电容量在50mA/g的电流密度下达到181F/g。分别采用KOH活化和混酸氧化的碳球为还原剂，可以有效地提高MnO2/碳球复合材料的比电容量和循环稳定性，相应复合材料的比电容量分别达到192F/g和218F/g，而且经过500次的充放电测试，仍然保持为184F/g和192F/g。
MnO2/carbon sphere composites (MnO2/CS composites) have been prepared in neutral KMnO4 solution using CS as a reducing reagent. The structures and electrochemical properties of the composites were investigated. The results reveal that the cycling stability of MnO2/CS composites electrodes is improved with increasing CS content, while the specific capacitance decreases. The specific capacitance of a composite containing 35% mass fraction of CS was 181F/g at a current density of 50mA/g. The stability and capacitance of the composite electrodes were greatly improved by using KOH activated or acidoxidized CS; the corresponding specific capacitances of the composite electrodes were increased to 192F/g and 218F/g, respectively. Furthermore, the values remained as high as 184F/g and 192F/g respectively, after 500 times charge-discharge cycles. MnO2/CS composites containing pretreated CS exhibit excellent capacitance characteristics as supercapacitor electrode materials.
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